mirror of
https://github.com/justinian/jsix.git
synced 2025-12-10 08:24:32 -08:00
3dffe564af
Several changes were needed to make this work: - Update the page_table::flags to understand memory caching types - Set up the PAT MSR to add the WC option - Make page-offset area mapped as WT - Add all the MTRR and PAT MSRs, and log the MTRRs for verification - Add a vm_area flag for write_combining
25 lines
478 B
C++
25 lines
478 B
C++
#include "msr.h"
|
|
|
|
msr
|
|
find_mtrr(msr type, unsigned index)
|
|
{
|
|
return static_cast<msr>(static_cast<uint32_t>(type) + (2 * index));
|
|
}
|
|
|
|
uint64_t
|
|
rdmsr(msr addr)
|
|
{
|
|
uint32_t low, high;
|
|
__asm__ __volatile__ ("rdmsr" : "=a"(low), "=d"(high) : "c"(addr));
|
|
return (static_cast<uint64_t>(high) << 32) | low;
|
|
}
|
|
|
|
void
|
|
wrmsr(msr addr, uint64_t value)
|
|
{
|
|
uint32_t low = value & 0xffffffff;
|
|
uint32_t high = value >> 32;
|
|
__asm__ __volatile__ ("wrmsr" :: "c"(addr), "a"(low), "d"(high));
|
|
}
|
|
|